Valve-grinding machine



Oct; 6,1925 1,556,197

.1; M. BARTLETT VALVE GRINDING MACHINE Filed Aug. 28, 1923 s Sheets-Shani 1 gwuwntoz firm 1-1 Oct. 6, 1925- 15 6,19?

J. NI. BARTLETT VALVE GRINDING MACHINE Filed Aug. 28, 1923 3 Sheets-Shut 2 Patented Oct. 6, 1925.

" UNITED STATES JOHN M. BARTLETfr, or WATERVI LE, MAINE,

VALVE GRIiiTDING MACHINE.

Application filed August 28, 1923. Serial No. 659,721. 7

To all whom it may concern:

Be it known that I, JOHN M. BARTLETT,

a citizen of the United States, residing at \Vaterville, in the county of Kennebec and State of Maine, have invented certain new and useful Improvements in valve G rinding. Machines, of which the following is a specification.

In carrying out the present invention 1t grinding of anchor and cut-out cocks of the kind employed in conjunction with airbrake works on cars and locomotives. However I do not wish to limit my machine to such a use as the same may be employed in conjunction with the grinding of practically all types of spring loaded or plug cocks.

The primary object of this invention resides in the provision of such a valve grind ing machine wherein the cooks or valves may be ground in considerably less time than is now consumed by the common hand grinding method, the invention comprising means 25 for oscillating the core and at the same time raising it periodically within its casing to change the position thereof with respect to the casing; 1 i

A. still further object of my invention is tively speaking, simple in construction and onethat will embrace at the same time the parent as the nature of the same is better.

understood the same comprising the novel form combination and arran ement of a n o parts set forth in the following detailed deis my purpose to provide a valve grinding machine that isespecially adapted for the to provide such a machine that is compara= scription, shown in the accompanying drawings and claimed.

In the drawings, wherein like reference characters" indicate corresponding parts" throughout the several views, I

Figure l is an end elevational view, with portions broken away, of my improved valve grinding machine.

,7 Figure 2 is a fragmentary bottom plan View of the structure seen in Figure 1, rotated through an angle of approximately 180.

. Figure 3 is adetail vertical section, with portions in elevation, of the machine, the section being taken approximately on the line 3=3 of Figure 7 V v Figure 4 is an enlarged detail view, partly in section and partly elevation, of a conventional type of cock, such as is employed in conjunction with the .air brake mechanism of a car or locomotive, showing the means employed for, maintaining the cock in operative position whilethe cock is being ground.

Figure 5 is a side elevational view ofan improved form of clamping mechanismthat is employed for. maintaining the cock in proper position upon the machine, and

; Figure 6 is a plan view of one. of the elements of. a specific form of clutch means that is employed. in conjunction with my invention.

Figure 7 is a fragmentary detail section taken. approximately on the line 7-7 of Figure 3.

Now having particular reference to the drawings, my novel machine embodies a supporting structure designated generally at 5 that. includes a top plate having appropriate supporting walls 7. Suitably j ouriraled atone end of the structure within bearings 8 is a transversely extending eccentric carrying shaft 9 upon one. end of whichis a beltpulley 10' the other end of said shaft carrying. a relatively small bevel gear ,11 (Figure 2) in mesh with a larger bevel gear l2upon one end of a tappet shaft 13 that is suitably journaled within bearings 14 formed upon the outer ends of arms 15 that are bolted or otherwise suitably s-ecured to the adjacent side wall 7 of said supporting structure.

lidable upon a pair of guide bars 16 that extend parallel with the side wall which is remote from the cam shaft 13 is a blocklike cross head 17, operatively connected to the eccentric on the shaft 9, through the medium of a conventional connecting rod 18. The parts of the machine so far described are not material and have been broadly stated and shown, and so far as the novelty defined by the claims is concerned, the parts may be modified and r fined.

The top 6 of the support is formed centrally with a circular opening 19 depending from the surrounding portion of which is a relatively elongated collar 20, formed integral with said plate, as more clearly shown in Figure 3. Freely rotatable within this collar 20 is an open ended sleeve 21, the upper end thereof terminating in a flange 22 that rests rotatably upon said top 6. The lower end of this sleeve 21 is formed internally in such a manner as to provide a seat 23 for the enlarged and rounded lower end portion 24 of a tubular shaft 25 within said sleeve 21, the lower end of this shaft 25 terminating in a reduced extension and having screw threaded extremity 26 with the portion thereabove being squared at 27 for slidable reception of a clutch element 28. in Figure 6 there is shown a link 29 that is formed at one end with a clutch element 30, centrally through which is an opening for receiving the lower cylindrical end of said shaft 25, this link being held on the shaft through the medium of a nut 31, Figure 3. The opposite end of this link 29 is also formed with. an opening for permitting attachment to the bifurcated end of a link 32 that is pivotally connected at its opposite end to the before mentioned cross head 17. Downward sliding movement of the clutch element 28 upon the squared portion of said shaft 25 is had through the medium of a hand lever 33 the inner end of which is pivoted at 34 to a bracket 35 formed in tegral with one of the walls 7 of the supaorting structure the inner end of this hand lever 33 being formed with a yoke 36 that carries inwardly directed pins for engagement within the circumferential channel upon the periphery of said clutch element 28 as clearly shown in Figs. 1 and 3.

Keyed to the before mentioned sleeve 21 and having close contact at its top face with the lower end of said collar 20 is a toothed wheel 37 the portion of said sleeve 21 be neath this wheel being externally screwthreaded for the reception of a jam nut whereby the sleeve 21 is maintained in proper position within said collar 20.

Freely slidable within a transverse openadjacent to the before mentioned shaft 13 is a latch 38 with its inner end normally in engagement with the teeth of said wheel 37 the outer end of this latch being pivotally secured to a pendant rocking lever 39 pivoted between its ends at 40 to a bracket 41 that is formed upon the adjacent side of said supporting frame, this rocking lever being norn'ially maintained in the position shown in Fig. 3 for consequently maintaining said latch 38 in engagement between the teeth of said wheel 37 through the medium of an expansion spring 42 between said supporting f ameand the lower end of the rocking lever 39.

The upper end of the before mentioned shaft 25 within the sleeve 21 terminates within said sleeve and is formed with a squared socket for receiving the squared shank 44 of the socket element 43 this shank being formed with a central vertical bore that is in alinement with a central vertical bore in said shaft 25, there being freely slidable within these bores a relatively elon gated pin 45 the lower end thereof protruding thru the lower end of said shaft 25 and the upper end thereof terminating within the recess of said socket element 43.

Pivoted to an inwardly extending bracket 46 that is formed upon the inside of the supporting frame 7 adjacent the cam shaft 13 is a bell crank 47 the inner arm of which is directly beneath the lower end of said pin 45 with the opposite arm thereof pivotally secured at 48 to a link 49 that extends outward through an inclined opening in the wall 7 and being adapted to be struck by a lug or tappet 50 formed upon the periphery of a disk 51 that is keyed to the before mentioned cam shaft 13. Also keyed upon this shaft 13 and adjacent to said disk 51 is a similar disk 52 which disk is also formed at its periphery with a lug- 53 this lug 53 being in staggered and spaced relation to the heft re mentioned lug 50 of the disk 51 and adapted for contacting the protrusion on the lever 39- when the same rotates, it being of course obvious tnat as the shaft 13 is rotated the lug 50 of the disk 51 will first strike the link 49 for consequently actuating the bell crank 47 and thereby raising the pin 45, the lug 53 of 'he disk also subsequently striking the lower end of the lever 39 for thereby retracting the dog 38 and releasing the toothed wheel 37 that is keyed to the before mentioned sleeve 21 and thereby permitting this sleeve 21 to rotate due to the friction between said shaft 25 and said sleeve.

in Fig. 4 there is shown a well known type of cock that is employed in conjunction with the air brake mechanism on cars and locomotives which cock includes a casmg in the side of the supporting frame 7 Y ingxat and a core 55.111 grinding the valve, it is-po'sitioned upon the flange 22 of the sleeve 21,- the lower: squared end 56 of said core being positioned within the recess of the socket element 43 already, de-

the core may be. removed and. antabrasive material (the thickness of which is exaggerated somewhat inFigure 4) placed upon said core after which thexcore is repositioned in the casing; vAfter this cock has been positioned asshown in Fig. 4 a pressure block designated generally at 57 isput to use. This pressureublock embodies a casing 58 that is open at its lower end and reduced and'externally screw-threaded for fitting'within the usually internally screwthreaded neck portion of the valve casing 54. Within this casing 58 is a circular disk 59 that carries upon opposite sides laterally projecting pins 60 that are movable -wit'hin slots 61 of said casing this disk being screw threaded at its lower end for receiving an internally screw-threaded cap 62 the bottom wall of which is provided with a central opening through which passes the squared lug 63 of a disk 64 this disk 64 and the above mentioned circular disk 59 being separated through the medium of ball bearings 65. The squared portion" 63 of said disk 64 is adapted for positioning within the usual squared socket upon the upper end of said core 55 and is to be maintained in such position through the medium of a compression spring within said c-asing 58 surrounding at its opposite ends circular pins that are formed respectively upon the closed end of said cage 58 and the top surface of said circular disk 59. I

The before mentioned flange 22' upon the upper end of said sl-eeve'21 is formed at its opposite sides with upstanding lugs or ears 66 to which are pivotally secured the lower ends of links 67 the upper-ends of these links (i'FJB-Xtending inwardly at 68 and between whichis a pin 69 to which is secured a cam lever 70, the cam portion thereof being adapted for positioning within the dished upper end of said pressure block cas ng 58-, it being obvious that a movement of this cam lever to the position shown in Figs. 1, 3 and 4 will consequently maintain the cock in alocked position upon the flange 22 of said sleeve 21; I v

The operation of. the improved valve grinding machine is as follows: The-shaft 9 is rotated from the pulley 10, which is driven from power received fromany appropriate source. Inasmuch as this shaft carries the pinion 11, the latter-mesheswith thebevel gear 12 and rotates the tappet shaft 13. Rotation of the .shaft'13 moves the discs 51 and 52 around to bring the 'tappets 50 and 53 into play in succession and at the appropriate time. Simultaneously with the operation of the shaft 13, the cross head 17 is reciprocated upon the guide track bar 16, through the medium of the connecting rod 18 andthe eccentric carried by the shaft 9. Obviously, since the link 32 is connected with the cross head or block 17, the arm 29, to which the link is connected, serves tooscillate the toothed head 30. However, since the head 30 surrounds the cylindrical lower portion of the so-called shaft 25, it may be said to be idling. However, by grasping the handle of the lever 33 and rocking it upwardly upon its pivot through the slot in the side. plate, the clutch element 28,. towhich it is connected is moved downwardly, and its teeth are meshedv with the teeth of the head 30. The'clutch element 28, being on the polygonal portion of the shaft 25', it: is clear that the shaft issetintomotiomand is oscillated through a comparatively small arc. Despite the fact that the-shaft 25 has frictional engagement with the sleeve 21, in which it is located, it does not effect a movement of the sleeve until the latter is'released.

The sleeve is maintained against rotation by distance. The latch is then automatically,

engaged with the cog wheel and the sleeve is again locked, but the] oscillation of the shaft 25 continues. It is clear that the os-' cillatory movement of the shaft and the relative rotary movement of the sleevevavries the contacting surfaces of the valve core and itscasing.

The particular kind of clamping mecha nism, employed in association with the valve, permits the result specified to be accomplished. Whilethe shaft 25 is oscillating, the core of the valve, to which it'is connected'through the medium of the part 43, "the pin 45 is reciprocated vertically and intermittently, ,to simultaneously lift the valve core for the purpose specified. The operation of the pin 45 isaccomplished, as before stated, through the medium of the tappet 50, contacting the rounded free end of the link 49 and sliding it inwardly in the direction of the arrow. The link, at its inner end, has sliding connection with the bell crank and the free end of the latter 811v gages the reciprocatory pin. ,It is thought that the foregoing is a clear idea of the operation of the device. At this time I would direct attention to Figure 7, wherein- I have shown fragments of the machine. In actual practice, the machine will be made up of a number of units, such as seen in Figure 2, and these units will be operated from the main drive shaft 9, already described. In accomplishing this result, I simply provide a sliding rod 72, which is connected with the link 32, and is slidable through a guide bracket 73. This rod 72, however, is broken away, but it is understood that it will be equipped with means for connection into the valve grinding device of the adjacent unit.

The specific operation together with numerous advantages of a machine of this character will be at once apparent to those skilled in the art and even though I have herein shown my machine as constituting certain specific structural elements, it is nevertheless to be understood that these elements may be modified without departing from the spirit and scope of the invention as claimed.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is 1. In a machine for grinding the cores of valves, a support, a sleeve mounted for rotation within said support, said sleeve including a portion adapted to receive a valve, a shaft freely oscillatable within said sleeve, said shaft embodying means for operatively connecting it to the core of the valve, means for oscillating said shaft, means for main taining said valve in position upon the sleeve, automatic means for raising the valve core within its casing during the oscillatory motion of said core, and means for intermittently rotating said sleeve and consequently imparting rotation to the casing during the oscillation of the core within the casing.

2. In a machine for grinding valves, a support, a sleeve disposed for intermittent rotation within said support, said sleeve including a portion adapted to receive a valve casing, a shaft journalled within said sleeve and adapted to be connected with the core of the valve, means for maintaining said valve in operative position upon said sleeve, means for oscillating said shaft for consequently imparting oscillation to said valve core, means operable during the rotation of said shaft for raising the valve core within its casing, and means for intermittently rotating said sleeve and valve casing while said core is being oscillated.

3. In a machine for grinding cores of valves, a support, a rotatable sleeve having an upper flanged end rotatably resting on said support, said flange being adapted to form a seat for a valve casing, a driven shaft angularly movable with and relative to the sleeve, valve core engaging and oscillating means carried by said shaft, a reciprocable core lifting pin slidable through the shaft, means for intermittently acting on said pin, and means for permitting intermittent rotation of said sleeve.

at. In a machine for grinding cores of valves, a support, a rotatable sleeve carried by said support and having a lateral flange at its upper end resting rotatably upon the top of the latter, a driven shaft oscillatable within the sleeve and having frictional engagement therewith, valve core engaging and oscillating means carried by said shaft, a core lifting pin slidable through the shaft and said core engaging means, means for oscillating said shaft, intermittently releasable means for holding said sleeve against rotation, and separate and independent means engageable with the aforesaid pin for reciprocating it at predetermined intervals.

5. In a machine for grinding cores of valves, a support having a flat top from which a collar depends, a sleeve extending rotatably through said collar and having a a lateral flange at its top resting rotatably on the top of said support, a driven shaft disposed within said sleeve and having friction driving connection therewith, a socket carried by the upper end of said shaft, a lifting pin extending slidably through said shaft and into said socket, operating means for oscillating said shaft, a release device in association with said sleeve, means acted on by the operating means for controlling said release device, and reciprocating means for said pin, said reciprocating means being acted on by said operating means.

6. In a machine for grinding cores of valves, a support, an oscillating driven shaft carried by said support, means carried by said shaft for engaging and oscillating one of the parts of the valve to be ground, means carried by said shaft for intermittently lifting said one part with respect to the other during the grinding operation, and a valve holding device carried by the support and including parts engaging the two parts of the valve for permitting oscillation of one with respect to the other and relative sliding movement also.

7. In a machine for grinding cores of valves, a support, a rotatable sleeve carried by said support and provided at its top with a seat adapted to receive a valve casing, a driven shaft arranged for oscillation within said sleeve and having driving frictional engagement therewith, a toothed member carried by and movable with said sleeve, a retractible pawl intermittently engageable with the teeth of said member, tappet operated means for actuating said pawl, a socket carried by the upper end of said driven shaft for engagement with the core of a valve, a reciprocable pin slidable through said shaft and into said socket for engaging and intermittently lifting said core, a bell Cir crank for actuating said pin, tappet operated means for actuating said bell crank, and simultaneously operated means for oscillating said shaft and rotating said tappet equipped means.

8. In a machine for grinding cores of valves, means for holding the parts of the valve While permitting them to move rela tive to each other, said means comprising a 10 cage having diametrically opposed slots formed in its wall, a separate cam clamp for the cage, a spring pressed disk Within the cage carrying guide pins extending slidably through said slots, a rotary core engaging member, and anti-friction balls interposed between said member and disk.

In testimony whereof I affix my signature.

' JOHN M. BARTLETT. 

